public class Main {
//    private final int a =0;
    String s="hellO";
    String str=new String("hello");

    public static void main(String[] args) {

    }

    public static void main2(String[] args) {
        StringBuffer stringBuffer=new StringBuffer("abcdef");
        stringBuffer.insert(3,"haha");
        System.out.println(stringBuffer);
    }

    public static void main1(String[] args) {
        Main a=new Main();
        System.out.println(a.s.equals(a.str));
    }
}